Um, as far as I know, you can go from BB30 to standard via an adapter, but not the other way around. Your bike needs to have a BB30 shell

It's a Ti frame and I can change the standard bb with a bb30, any Ti frame builder can do this.That's why I wonder if the new setup (Sram RED BB30 of FSA BB30) is lighter than the current one (Shimano Dura Ace 7900 crank).

Cutting-and-shutting the BB shell from threaded to BB30 is a whole lot of aggravation for a few grammes - I wouldn't consider this to be a viable option and would probably be as expensive as a whole new frame.

Standard English BB shell has internal diameter of 34.8mm - putting a BB30 shaft through there leaves 4.8mm of 'space' for the bearings - just exactly where do the bearings go? FWIW Rotor BSA 30 uses a 30mm spindle but bearing are placed external to the shell - but this won't work with a regular BB30 crank.

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